Extensible shaft.



PATENTED MAY 26, 1903 I. LBHMAN.

EXTENSIBLE SHAFT.

' APPLICATION FILED JULY 31' 1902.

Y0 MODEL.

INVENTOH mmsism:

AA... ATTORNEY;

Patented May 26,1903.

PATENT OFFICE.

ISADOR LEHMAN, OF CLEVELAND, OHIO.

EXTENSIIBLE. SHAFT.

SPECIFICATION forming part of Letters Patent No. 729,365, dated May 26, 1903.

Application filed my 31, 1902. $erialNo.-117.804. on model.)

To all whom it mag concern:

Be it known'that I, ISADOR' LEHMAN, a citizen of the United States of America, residing at Cleveland, in the county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Extensible Shafts; and Ihereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artto which it pertains to make and use the same;

In the accompanying drawings, Figure I is a side elevation, largely in central longitudinal section, of my-improved extensible shaft. Fig. II is a horizontal section on line II II, Fig. I. Fig. III is an enlarged transverse Vertical section on line III III, Fig. I. Fig. IV is an enlarged transverse vertical section on line IV IV, Fig. .I, looking in the direction in dicated by the arrow. Fig. V is a side elevation, in central longitudinal section, illustrating the manner of introducing the endwise-shiftable shaft-section into the relative stationary shaft-section.

My improved extensible shaft comprises an endwise-shiftable shaft-section-a, which extends into and longitudinally of the relatively stationary section b of the shaft. The shaftsection b is provided, in one end portion thereof and centrally, with a bore 0, which extends a suitable distance inwardly from the outer extremity of the said end portion and is just large enough diametrically to accommodate the extension of the shaft-section a into and longitudinally of the said bore and to accommodate the shiftability of the said shaft-section a endwise of the shaft-section b. Two parallel grooves d and d are formed in d, as shown in Fig; III.

the surrounding wallof the bore 0 at opposite sides, respectively,-of the said bore and are engaged by projecting members with which the shaft-section a is provided, which projecting members comprise, respectively, a lug e, a

which is integral with the shaft-section a and projects from the said shaft-section a at a right angle to the axial line of the shaft, and

an antifriction-roller f is mounted upon the said lug and is smaller diametrically than the engaging groove (I, so that each roller f during the rotation of the shaft engages only one of the side walls of the engaging groove It will be observed,

therefore, that the rollers f have their axes at right angles to the axial line of the shaft.

The shaft-section b is reduced in external diameter a short distance along the outer end of the bore 0 inwardly from the outer extremity of the said bore, and the said diametricallyreduced end. of the said shaft-section Z) is screw-threaded externally, and a correspondingly internally screw-threaded sleeve h is mounted upon the said diametrically-reduced end of the said shaft-section.

The sleeve h is provided at the outer extremity of the said diametrically-reduced end of theshaft-section b with an internalannular flange k, which closely but easily embraces the bore 0 and forms a guard arranged to prethe grooves d of the shaft-section b, and the said flange k is provided with two diametric- -thefshaft-section a at the outer extremity of allyoppositely located slots Z,which are adapted upon the required manipulation of the sleeve h during the assemblage of the parts to register with the grooves d of the shaft-section I), as shown in Fig. V, so as to accommodate the passage of the roller-bearin g members of the shaft-section a into the said grooves during the introduction of the said shaft-section a into the shaft-section b, and obviously, therefore, the said sleeve h, as shown in Fig.

'V, is not fully screwed into place on the shaftsection 1) until the said roller-bearing mem bers have, during the assemblage of the parts, passed fully into the said grooves d, and the said sleeve is turned enough when the rollerbearing members of the shaft-section a have wholly passed into the grooves cl during the assemblage of the-parts to bring the slotsl of the sleeve-flange out of registry with the grooves (Z and to close the said slots at the inner side of the said flange by the flange-facing surface of the adjacent end of the shaft-section I), as shown in Fig. II, so as to prevent dirt or foreign matter from passing into the grooves (Z through the said slots.

Means for preventing circumferential displacement of the sleeve h upon the assemblage of the parts is provided, as shown in Fig. I, and comprises a screw or pin m, which extends through a hole 0, formed in the said sleeve,

' into the hole 1", formed in the shaft-section I),

and the arrangement of the parts is such that when duringthe assemblage of the parts the sleeve has been turned far enough to bring the hole 0 in the sleeve into registry with the hole a in the shaft-section Z) the slots Z of the sleeve-flange 70 shall be out of registry with the grooves (I of the said shaft-section and closed at their inner sides, as aforesaid.

What I claim is- 1. An extensible shaft comprising the following: a shaft-section provided interiorly with a bore which extends a suitable distance inwardly from one extremity of the said section and has a groove which is formed in the surrounding wall of the said bore and ex tends inwardly from the outer extremity of and parallel with the bore; a shaft-section engaging and extending longitudinally of the said bore and provided with a roller engaging the aforesaid groove and having its axis at a right angle to the axialline of the shaft, and a sleeve attached to the interiorly-bored shaftsection at the outer end of the aforesaid bore and provided with an inner annular flange which closely but easilyembraces the roller-bearing shaft-section.

2. An extensible shaft comprising the following: a shaft-section provided interiorly with a bore which extends a suitable distance inwardly from one extremity of the said section and has a plurality of grooves which are formed in the surrounding wall of the said bore and extend inwardly from the outer extremity of and parallel with the bore, and a shaft-section engaging and extending longitudinally of the said bore and provided with roller-bearin g members which project into the aforesaid grooves and have the rollers smaller diametrically than the width of the engaging grooves.

3. An extensible shaft comprising the following: a shaft-section provided interiorly with a bore which extends a suitable distance inwardly from one extremity of the said section and has a plurality of grooves which are formed in thesurrounding wall of the said bore and extend inwardly from the outer extremity of the bore to the inner end of the bore; a shaft-section engaging and extending longitudinally of the said bore and having members projecting into the aforesaid grooves, and a sleeve attached to the interiorly-bored shaft-section at the outer end of the aforesaid bore and provided with an inner annular flange which closely but easily embraces the aforesaid bore-en gaging shaft-section.

4. An extensible shaft comprising the fol lowing: a shaft-section provided interiorly with a bore which extends a suitable distance inwardly from one extremity of the said section and has aplurality of grooves which are formed in the surrounding wall of the said bore and extend inwardly from the outer extremity of and parallel with the bore, which shaft-section is screw-threaded externally at the outer end of the said bore; a shaft-section engaging and extending longitudinally of the said bore and having members which engage the aforesaid grooves; an internally-screwthreaded sleeve screwed onto the interiorlybored shaft-section at the outer end of the aforesaid bore and provided with an inner annular flange which closely but easily embraces the aforesaid bore-en gaging shaft-section and has slots arranged to register with the aforesaid grooves upon turning the sleeve upon the sleeve-bearing shaft-section to the required extent, and means for preventing circumferential displacement of the said sleeve when the sleeve is arranged with its slots out of registry with the said grooves.

In testimony whereof I sign the foregoing specification, in the presence of two witnesses, this 21st day of July, 1902, at Cleveland, Ohio.

ISADOR LEIIMAN. lVitnesses:

C. II. DORER, TELSA SCHWARTZ. 

